CASSGO-53 ObservedQuery.Consistency and ObservedBatch.Consistency fields

[worryg0d]

During retries, consistency of the query may be changed by retry policy implementations (e.g. DowngradingConsistencyRetryPolicy). To observe consistency changes new ObservedQuery.Consistency and ObservedBatch.Consistency fields were added.

Patch by Bohdan Siryk; Reviewed by <> for CASSGO-53

Closes #1798

[joao-r-reis]

Hmm this probably has some overlap with #1447 , I'm going to prototype a bit and see if I can come up with a proposal for some potential API changes to resolve #1447 and these API changes will probably affect this issue/pr (#1862)

[worryg0d]

Ah, I see. We want to make Query immutable so changes to consistency won't be mirrored in Query and Batch, but in Iter. However, it shouldn't change this impl a lot

[worryg0d]

Some weird things are happening with CI again...

Installing script cli archive...
* Downloading...
curl: (22) The requested URL returned error: 503

'curl --fail --location --progress-bar "${SDKMAN_SERVICE}/broker/download/native/install/${SDKMAN_NATIVE_VERSION}/${SDKMAN_PLATFORM}" > "$sdkman_zip_file"': command failed with exit code 22.
Error: Process completed with exit code 22.